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[Saba (mcs 4th)]

	Assignment No. 2 Graded Semester Fall 2015 Data Warehousing– CS614
Objective: The assignment has been designed to develop your ability to design star schema and to estimate the rows in fact table.  Instructions: Please read the following instructions carefully before solving & submitting assignment:   1.      The assignment will not be accepted after due date. 2.      Zero marks will be awarded to the assignment that does not open or the file is corrupt. 3.      The assignment file must be an MS Word (.doc) file format; Assignment will not be accepted in any other format. 4.      Zero marks will be awarded to the assignment if copied (from other student or copied from handouts or internet). 5.      Zero marks will be awarded to the assignment if the Student ID is not mentioned in the assignment file.   For any query about the assignment, contact only at [e-mail] Do not post queries related to assignment on MDB.   GOOD LUCK
Question 1                                                                                                                                         [15 Marks]   The Future Tech College has to design a star schema related to the grades for courses completed by the students. The tables with the attributes are as given below. Table Name Attributes Other Details Course-Section Course_ID, Sec_No, Course_Name, Units, Room_ID, Room_Capacity. During a given semester total sections of courses are 500. Professor Prof_ID, Prof_Name, Title, Department_ID, Department_Name.   Student Student_ID, Student_Name, Major. Each course section comprises of not more than 30 students. Period Semester_ID, Year. The data of 10 years is maintained with each having 30 periods in total You have to; Design the star schema to record the grades for the courses completed by the students and the date of completion.  Estimate the number of rows in fact table by using the details given in the above table.   You may use the MS Vision or any other similar tool to draw the Star Schema.

[R.Ali]

sir tariq sahib please help for above given link

[tariq mahmood]

konsa link bhai

[0ncomss017222]

can we use ms word for draw star Sachema????????

[binish.arshar]

bana li he apne schema ?

[R.Ali]

[R.Ali]

[R.Ali]

What is star schema? The star schema architecture is the simplest data warehouse schema. It is called a star schema because the diagram resembles a star, with points radiating from a center. The center of the star consists of fact table and the points of the star are the dimension tables. Usually the fact tables in a star schema are in third normal form(3NF) whereas dimensional tables are de-normalized. Despite the fact that the star schema is the simplest architecture, it is most commonly used nowadays and is recommended by Oracle.

Fact Tables

A fact table typically has two types of columns: foreign keys to dimension tables and measures those that contain numeric facts. A fact table can contain fact's data on detail or aggregated level.

Dimension Tables

A dimension is a structure usually composed of one or more hierarchies that categorizes data. If a dimension hasn't got a hierarchies and levels it is called flat dimension or list. The primary keys of each of the dimension tables are part of the composite primary key of the fact table. Dimensional attributes help to describe the dimensional value. They are normally descriptive, textual values. Dimension tables are generally small in size then fact table.

Typical fact tables store data about sales while dimension tables data about geographic region(markets, cities) , clients, products, times, channels.

The main characteristics of star schema:
Simple structure -> easy to understand schema
Great query effectives -> small number of tables to join
Relatively long time of loading data into dimension tables -> de-normalization, redundancy data caused that size of the table could be large.
The most commonly used in the data warehouse implementations -> widely supported by a large number of business intelligence tools

[binish.arshar]

but we need diagram ?

[R.Ali]

[R.Ali]

[Ahmad MIT]

koi solution send kry 

[0ncomss017222]

i did not understand to this assignment